CONTROL OF THE CHAMBER IN EXTRA-THICK COAL SEAM BASED ON FRACTURE CHARACTERISTICS OF COAL ROCK AND MASS

As the development characteristics of cracks of the chamber are closely Retinol related to the bolt and cable anchoring parameters, the original rock stress of the surrounding rock, and fracture degree, this paper proposes the control method for chamber in extra-thick coal seam by the crack development characteristics.Based on the numerical model a

Abstract Background Cutaneous leishmaniasis is an infectious disease Essential Nutrition caused by various species of the flagellate protozoan Leishmania.During the past 20 years, cutaneous leishmaniasis has emerged as a major public health threat in Morocco.The main objective of this study was to study the occurrence of Leishmania infection in vec